Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2017 Mar. 25.79, 8.0, 2' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x40 binoculars)
2017 Mar. 24.87, 7.9, 4' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Mar. 24.87, 8.0, 3' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Mar. 24.35, 7.2, 3' (M. Goiato, 20x100 binoculars)
2017 Feb. 27.77, 8.7, 2' (M. Buechner, Kempten, 10x70 binoculars)
2017 Feb. 27.76, 7.9, 2' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Feb. 27.74, 9.4, 1.62' (P. Jordanov, Dimitrovgrad-Krum, Bulgaria, 0.15-m Newtonian reflector)
2017 Feb. 27.11, 8.2, 1.5' (C. Hergenrother, 30x125 binoculars)
2017 Feb. 26.76, 8.4, 1.4' (J. Cerny, 0.355-m Newtonian reflector)
2017 Feb. 25.79, 8.8, 3' (C. Labordena, Castellfort, 0.2-m Schmidt-Cassegrain)
2017 Feb. 25.76, 8.5, 1.7' (W. Vollmann, 0.054-m refractor)
2017 Feb. 24.83, 8.4, 2' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Feb. 24.82, 8.8, 2.5' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Feb. 24.79, 7.6, 1.5' (T. Karhula, Lysvik, Sweden, 18x50 binoculars)
2017 Feb. 24.77, 8.5, 4' (M. Hahn, Kiel, 0.09-m refractor)
2017 Feb. 24.77, 9.0, 1.7' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Feb. 24.76, & 7.9, 2' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)

41P/Tuttle-Giacobini-Kresak
Total-magnitude and coma-diameter estimates:
2017 Mar. 26.00, 7.2, 24' (M. Collins, Everton, 7x50 binoculars)
2017 Mar. 25.90, 7.3, 17' (M. Meyer, 20x88 binoculars)
2017 Mar. 25.85, 7.2, 22' (J. Cerny, 0x40 binoculars)
2017 Mar. 25.25, 7.3, 35' (R. Ramlow, 0.106-m refractor)
2017 Mar. 25.21, 7.3, 18' (C. Hergenrother, 10x50 binoculars)
2017 Mar. 25.13, [ 7.3, -- (S. Aguirre, Hillo, Mex., 7x50 binoculars)
2017 Mar. 25.13, 8.0, 11' (J. Fraser, Alness, Scotland., 20x60 binoculars)
2017 Mar. 24.97, 7.5, 20' (W. Kutschera, 0.13-m refractor)
2017 Mar. 24.87, 9.2, 3.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 24.85, 7.5, 18' (V. Kasten, 15x50 binoculars)
2017 Mar. 24.84, 7.1, 19' (M. Meyer, 20x88 binoculars)
2017 Mar. 24.83, 7.5, 30' (U. Pilz, 7x50 binoculars)
2017 Mar. 24.79, 7.9, 20' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Mar. 24.18, [ 7.5, -- (S. Aguirre, Hillo, Mex., 7x50 binoculars)
2017 Mar. 24.14, 7.0, 26' (V. Kasten, 15x50 binoculars)
2017 Mar. 23.88, 7.8, 13' (G. van Buitenen, Dordrecht, NL, 0.306-m Newtonian reflector)
2017 Mar. 23.85, 8.2, 14' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Mar. 23.39, 7.5, 36' (R. Ramlow, 0.106-m refractor)
2017 Mar. 23.13, [ 7.5, -- (S. Aguirre, Hillo, Mex., 7x50 binoculars)
2017 Mar. 22.95, 7.9, 17' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Mar. 22.90, 8.0, 12' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 22.89, 7.4, 22' (C. Harder, Jeersdorf, Germany , 8x44 binoculars)
2017 Mar. 22.88, 7.0, 22' (V. Kasten, 20x80 binoculars)
2017 Mar. 22.83, 7.7, 15' (C. Labordena, La Serra, 11x80 binoculars)
2017 Mar. 22.58, 7.3, 16' (S. Yoshida, 0.07-m refractor)
2017 Mar. 22.54, 8.3, 10' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 22.36, 7.4, 3.21' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.431-m Cassegrain reflector)
2017 Mar. 22.13, 9.3, -- (S. Aguirre, Hillo, Mex., 0.15-m Schmidt-Cassegrain)
2017 Mar. 22.12, [ 7.5, -- (S. Aguirre, Hillo, Mex., 7x50 binoculars)
2017 Mar. 22.08, 8.0, 17' (M. Hahn, Kiel, 0.09-m refractor)
2017 Mar. 21.97, 8.8, 6.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 21.93, 7.5, 25' (C. Harder, Jeersdorf, Germany , 8x44 binoculars)
2017 Mar. 21.91, 7.9, 15' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2017 Mar. 21.89, 10.0, 9' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 21.83, 7.9, 15' (G. van Buitenen, Dordrecht, NL, 0.305-m Newtonian reflector)
2017 Mar. 21.22, 7.4, 33' (R. Ramlow, 0.106-m refractor)
2017 Mar. 21.22, 7.0, 65' (T. Lehmann, 0.106-m refractor)
2017 Mar. 21.11, [ 7.0, -- (S. Aguirre, Hillo, Mex., 7x50 binoculars)
2017 Mar. 21.08, 8.0, 8' (M. Goiato, 20x100 binoculars)
2017 Mar. 20.85, 9.1, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 20.27, 8.9, 8' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector)
2017 Mar. 20.12, 9.0, -- (S. Aguirre, Hillo, Mex., 0.15-m Schmidt-Cassegrain)
2017 Mar. 20.02, 7.5, 20' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Mar. 19.87, 8.0, 8' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2017 Mar. 19.80, 7.2, 20' (T. Karhula, Virsbo, Sweden, 8x20 binoculars)
2017 Mar. 19.36, 7.6, 2.35' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.431-m Cassegrain reflector)
2017 Mar. 19.27, 7.0, 70' (T. Lehmann, 0.106-m refractor)
2017 Mar. 19.23, 7.6, 30' (R. Ramlow, 0.106-m refractor)
2017 Mar. 19.19, 7.4, 20' (C. Hergenrother, 10x50 binoculars)
2017 Mar. 18.93, 7.4, 15' (T. Karhula, Virsbo, Sweden, 8x40 binoculars)
2017 Mar. 18.90, 7.2, 12' (B. Granslo, Dombås, 10x42 binoculars)
2017 Mar. 18.84, 8.5, 10' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 18.83, 7.5, 20' (C. Harder, Jeersdorf, Germany , 15x50 binoculars)
2017 Mar. 18.21, 7.4, 22' (C. Hergenrother, 10x50 binoculars)
2017 Mar. 17.86, 7.5, 10' (T. Karhula, Virsbo, Sweden, 10x50 binoculars)
2017 Mar. 17.21, 7.5, 16' (C. Hergenrother, 10x50 binoculars)
2017 Mar. 16.95, 9.8, 5.64' (D. Buczynski, Tarbatness Observatory MPC Code I81, 0.35-m Schmidt-Cassegrain)
2017 Mar. 16.87, 10.2, 3' (J. Kohr, 0.254-m Schmidt-Cassegrain)
2017 Mar. 16.86, 9.7, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 16.85, 7.6, 15' (M. Meyer, 20x88 binoculars)
2017 Mar. 16.84, 7.5, 50' (T. Lehmann, 0.075-m reflector; 0.25-deg tail in p.a. 171)
2017 Mar. 16.83, 8.5, 15' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2017 Mar. 16.83, 8.0, 15' (A. Novichonok, 15x70 binoculars)
2017 Mar. 16.82, 9.8, 5' (J. Navarro Pina, Campos del Rio ( Murcia , Spain ), 0.305-m Newtonian reflector)
2017 Mar. 16.82, 8.1, 10' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 Mar. 16.81, 7.3, 10' (U. Pilz, 16x70 binoculars)
2017 Mar. 16.80, 9.0, 5.5' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 16.31, 9.4, 7' (M. Linnolt, Volcano, Hawaii, 0.417-m Newtonian reflector)
2017 Mar. 15.89, 7.8, 17' (J. Gonzalez Suarez, 10x50 binoculars)
2017 Mar. 15.85, 8.9, 18' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2017 Mar. 15.84, 9.7, 3.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 15.81, 11.2, 5' (J. Navarro Pina, Campos del Rio ( Murcia , Spain ), 0.305-m Newtonian reflector)
2017 Mar. 15.80, 7.5, 20' (P. Guzik, 10x50 binoculars)
2017 Mar. 15.80, 8.5, 20' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Mar. 15.79, 8.8, 10' (M. Lehký, 20x100 binoculars)
2017 Mar. 15.12, 8.1, 20.5' (R. Ramlow, 0.15-m Newtonian reflector)
2017 Mar. 14.95, 10.3, 4.9' (D. Buczynski, Tarbatness MPC Code I81, 0.35-m Schmidt-Cassegrain)
2017 Mar. 14.88, 7.9, 10' (C. Labordena, Culla, 11x80 binoculars)
2017 Mar. 14.86, 11.0, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 14.84, 9.9, 3' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2017 Mar. 13.98, 10.8, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 13.87, 9.2, 5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 13.23, 7.1, 45' (T. Lehmann, 0.106-m refractor; 0.3-deg tail in p.a. 162)
2017 Mar. 13.12, 8.5, 9' (C. Hergenrother, 10x50 binoculars)
2017 Mar. 09.92, 9.4, 5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 08.08, 9.8, 2.3' (N. Paul, Canary Island - Spain - Mt. Teide - MPC G40, 0.5-m Cassegrain reflector)
2017 Mar. 07.45, 9.2, 5' (C. Hergenrother, 30x125 binoculars)
2017 Mar. 07.41, 7.7, 50' (T. Lehmann, 0.106-m refractor)
2017 Mar. 07.39, 8.7, 15.5' (R. Ramlow, 0.106-m refractor)
2017 Mar. 07.29, 9.7, 2.7' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.431-m Cassegrain reflector)
2017 Mar. 06.97, 10.1, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 06.85, 10.8, 11.73' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector)
2017 Mar. 06.60, 9.2, 7' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Mar. 05.33, 8.0, 50' (T. Lehmann, 0.106-m refractor)
2017 Mar. 04.95, 8.8, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 04.95, 8.8, 7' (G. Scheerle, 9x63 binoculars)
2017 Mar. 03.72, 10.4, 5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 03.24, 9.3, 14' (R. Ramlow, 0.106-m refractor)
2017 Mar. 03.01, 9.6, 11.3' (J. Cerny, 0.355-m Newtonian reflector)
2017 Mar. 02.94, 10.1, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Mar. 02.93, 9.8, 6' (V. Kasten, 0.2-m Newtonian reflector)
2017 Mar. 02.91, 11.4, 3.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 02.91, 10.0, 3.5' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 5.0' tail in p.a. 175)
2017 Mar. 02.79, 10.8, 5.28' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector)
2017 Mar. 02.22, 8.3, 45' (T. Lehmann, 0.106-m refractor)
2017 Mar. 02.20, 9.4, 14.2' (R. Ramlow, 0.106-m refractor)
2017 Mar. 02.10, 10.2, 6' (M. Goiato, 0.22-m Newtonian reflector)
2017 Mar. 01.97, 9.0, 12' (P. Guzik, 10x50 binoculars)
2017 Mar. 01.84, 9.4, 12' (J. Konecny, Hlivice, 25x100 binoculars)
2017 Mar. 01.80, 9.4, 4.5' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Mar. 01.77, 9.9, 9' (W. Vollmann, 0.054-m refractor)
2017 Mar. 01.64, 11.0, 3.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 Mar. 01.01, 9.1, 7' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Mar. 01.00, 10.4, 8.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Feb. 28.91, 10.1, 7' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2017 Feb. 28.85, 12.5, 6' (P. Jordanov, NAOP-Dimitrovgrad, Bulgaria, 0.15-m Newtonian reflector)
2017 Feb. 28.03, 9.2, 10' (P. Guzik, 10x50 binoculars)
2017 Feb. 27.80, 10.0, 6' (M. Lehký, 20x100 binoculars)
2017 Feb. 27.13, 9.6, 5' (C. Hergenrother, 30x125 binoculars)
2017 Feb. 27.03, 9.2, 12' (P. Guzik, 10x50 binoculars)
2017 Feb. 26.89, 9.6, 4' (G. Scheerle, 9x63 binoculars)
2017 Feb. 26.88, 9.8, 4.5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Feb. 26.83, 10.8, 1.8' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Feb. 26.82, 10.6, 5.1' (J. Cerny, 0.355-m Newtonian reflector)
2017 Feb. 26.17, [10.6, -- (S. Aguirre, Hermosillo, Mexico, 0.15-m Schmidt-Cassegrain)
2017 Feb. 25.98, 11.2, 2.5' (C. Labordena, Castellfort, 0.2-m Schmidt-Cassegrain)
2017 Feb. 25.89, 9.5, 7.8' (M. Paradowski, Lublin, Poland, 0.068-m refractor)
2017 Feb. 25.80, 10.7, 2.8' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Feb. 25.32, 8.8, 40' (T. Lehmann, 0.106-m refractor)
2017 Feb. 25.23, 10.1, 8.2' (R. Ramlow, 0.106-m refractor)
2017 Feb. 25.21, 10.8, 2.54' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.431-m Cassegrain reflector)
2017 Feb. 25.14, 9.6, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Feb. 24.97, 10.2, 6' (P. Guzik, 0.27-m Newtonian reflector)
2017 Feb. 24.96, 9.8, 10' (P. Guzik, 10x50 binoculars)
2017 Feb. 24.94, 11.1, 2' (T. Karhula, Lysvik, Sweden, 0.305-m Newtonian reflector)
2017 Feb. 24.91, 10.9, 2.5' (M. Meyer, 0.254-m Newtonian reflector)
2017 Feb. 24.90, 9.4, 6' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Feb. 24.89, 10.0, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Feb. 24.81, 11.1, 2.6' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)

43P/Wolf-Harrington
Total-magnitude and coma-diameter estimates:
2017 Mar. 05.02, 14.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 02.74, 14.6, 0.4' (R. Ramlow, 0.51-m Newtonian reflector; 4.8' tail in p.a. 290)

45P/Honda-Mrkos-Pajdusakova
Total-magnitude and coma-diameter estimates:
2017 Mar. 24.82, 11.8, 2.5' (U. Pilz, 0.32-m Newtonian reflector)
2017 Mar. 22.61, 13.6, 1' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 22.26, 11.0, 15' (T. Lehmann, 0.106-m refractor; 0.9-deg tail in p.a. 283)
2017 Mar. 20.13, [10.6, -- (S. Aguirre, Hillo, Mex. , 0.15-m Schmidt-Cassegrain)
2017 Mar. 20.05, 11.0, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 16.94, 11.0, 12' (T. Lehmann, 0.075-m reflector; 1.1-deg tail in p.a. 283)
2017 Mar. 16.80, 8.8, 5' (U. Pilz, 16x70 binoculars)
2017 Mar. 16.19, 10.6, 14' (T. Lehmann, 0.106-m refractor; 0.9-deg tail in p.a. 285)
2017 Mar. 15.78, 13.0, 2' (P. Guzik, 0.326-m Newtonian reflector)
2017 Mar. 15.13, 10.3, 3.3' (R. Ramlow, 0.15-m Newtonian reflector; 26.0' tail in p.a. 285)
2017 Mar. 14.86, 10.5, 5' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2017 Mar. 13.88, 10.2, 3.5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 09.91, 10.6, 4' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 09.91, 12.8, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 08.68, 10.5, 5.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Mar. 07.42, 9.5, 22' (T. Lehmann, 0.106-m refractor; 1.2-deg tail in p.a. 282)
2017 Mar. 06.95, 11.6, 2.4' (P. Carson, Southend on Sea, Essex, UK, 0.315-m Cassegrain reflector)
2017 Mar. 05.38, 9.5, 19' (T. Lehmann, 0.106-m refractor; 1.0-deg tail in p.a. 284)
2017 Mar. 04.96, 10.0, 7' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Mar. 03.73, 10.7, 6' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 03.16, 12.2, 4.1' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 03.03, 10.2, 6' (J. Cerny, 0.355-m Newtonian reflector; 0.25-deg tail in p.a. 270)
2017 Mar. 02.96, 11.2, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Mar. 02.92, 11.0, 4.5' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 02.82, 11.2, 6.5' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector; 23.8' tail in p.a. 285)
2017 Mar. 02.23, 8.4, 37' (T. Lehmann, 0.106-m refractor; 1.5-deg tail in p.a. 284)
2017 Mar. 02.20, 9.3, 11' (R. Ramlow, 0.106-m refractor; 1.22-deg tail in p.a. 280)
2017 Mar. 02.14, 8.2, 12' (M. Goiato, 20x100 binoculars)
2017 Mar. 01.98, 9.2, 14' (P. Guzik, 10x50 binoculars)
2017 Mar. 01.82, 9.7, 3.5' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Feb. 28.92, 10.2, 7' (A. Scholten, Eerbeek, 0.2-m Newtonian reflector)
2017 Feb. 28.86, 8.2, 8' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Feb. 28.04, 8.6, 15' (P. Guzik, 10x50 binoculars)
2017 Feb. 28.01, 9.7, 20' (J. Navarro Pina, El Palmar ( Murcia , Spain ), 0.305-m Newtonian reflector)
2017 Feb. 27.78, 8.6, 14' (M. Lehký, 20x100 binoculars)
2017 Feb. 27.04, 8.2, 20' (P. Guzik, 10x50 binoculars)
2017 Feb. 27.03, 9.4, 10' (G. Scheerle, 9x63 binoculars)
2017 Feb. 27.01, 9.4, 9' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Feb. 26.84, 9.3, 12' (J. Cerny, 0.355-m Newtonian reflector; 0.6-deg tail in p.a. 280)
2017 Feb. 26.83, 10.2, 5.4' (W. Hasubick, 0.44-m Newtonian reflector)
2017 Feb. 25.96, 10.0, 7.8' (M. Paradowski, Lublin, Poland, 0.068-m refractor; 0.28-deg tail in p.a. 280)
2017 Feb. 25.95, 7.9, 16' (C. Labordena, Castellfort, 11x80 binoculars)
2017 Feb. 25.81, 8.7, 15' (W. Vollmann, 0.054-m refractor; 0.5-deg tail in p.a. 285)
2017 Feb. 25.34, 8.0, 40' (T. Lehmann, 0.106-m refractor; 1.6-deg tail in p.a. 284)
2017 Feb. 25.16, 8.8, 15' (W. Vollmann, 0.054-m refractor; 1.0-deg tail in p.a. 275)
2017 Feb. 25.09, 8.5, 12' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 Feb. 24.99, 10.3, 6' (T. Karhula, Lysvik, Sweden, 0.305-m Newtonian reflector)
2017 Feb. 24.98, 8.4, 15' (P. Guzik, 10x50 binoculars; 0.5-deg tail in p.a. 250)
2017 Feb. 24.98, 7.8, 16' (G. Scheerle, 9x63 binoculars)
2017 Feb. 24.93, 10.0, 5' (M. Meyer, 0.254-m Newtonian reflector)
2017 Feb. 24.93, [10.2, 5' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Feb. 24.91, 9.0, 8' (A. Scholten, Bussloo, 15x80 binoculars)
2017 Feb. 24.91, 7.8, 12' (J. Gonzalez Suarez, 10x50 binoculars; 1.2-deg tail in p.a. 290)
2017 Feb. 24.89, 9.0, 5.5' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 15.0' tail in p.a. 290)

65P/Gunn
Total-magnitude and coma-diameter estimates:
2017 Mar. 08.75, 16.1, 0.4' (R. Ramlow, 0.7-m Newtonian reflector)
2017 Mar. 05.25, 15.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 03.11, 13.5, 0.9' (J. Cerny, 0.355-m Newtonian reflector)
2017 Feb. 26.23, 13.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 Mar. 08.46, 16.4, 1.2' (T. Lehmann, 0.106-m refractor)
2017 Mar. 06.76, 16.5, 0.33' (R. Ramlow, 0.7-m Newtonian reflector)

73P-BT/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 Mar. 24.86, 11.5, 1.5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Mar. 06.79, 12.9, 0.35' (R. Ramlow, 0.7-m Newtonian reflector)
2017 Mar. 02.80, 12.3, 0.4' (C. Hergenrother, 0.51-m Ritchey-Chretien)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2017 Mar. 02.06, 16.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

93P/Lovas
Total-magnitude and coma-diameter estimates:
2017 Feb. 26.77, 13.2, 1.2' (G. Scheerle, 0.235-m Schmidt-Cassegrain)

118P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates:
2017 Mar. 08.20, 17.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

128P/Shoemaker-Holt
Total-magnitude and coma-diameter estimates:
2017 Feb. 25.89, 16.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

144P/Kushida
Total-magnitude and coma-diameter estimates:
2017 Mar. 05.69, 15.3, 0.7' (R. Ramlow, 0.406-m Newtonian reflector)
2017 Mar. 05.24, 14.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)

158P/Kowal-LINEAR
Total-magnitude and coma-diameter estimates:
2017 Mar. 01.10, 18.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

234P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 Mar. 04.03, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

314P/Montani
Total-magnitude and coma-diameter estimates:
2017 Mar. 01.03, 17.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

315P/LONEOS
Total-magnitude and coma-diameter estimates:
2017 Mar. 23.30, 14.4, 0.6' (R. Ramlow, 0.106-m refractor; 1.0' tail in p.a. 200)
2017 Mar. 22.56, 14.0, 0.5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 22.28, 14.3, 3.3' (T. Lehmann, 0.106-m refractor; 0.07-deg tail in p.a. 265)
2017 Mar. 16.90, 14.5, 1.7' (T. Lehmann, 0.075-m reflector; 0.01-deg tail in p.a. 220)
2017 Mar. 15.83, 12.3, 1.7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 15.81, 14.2, 0.4' (P. Guzik, 0.326-m Newtonian reflector)
2017 Mar. 15.31, 14.5, 1.3' (T. Lehmann, 0.106-m refractor; 0.02-deg tail in p.a. 250)
2017 Mar. 03.75, [13.5, 0.8' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 03.08, 14.4, 1' (J. Cerny, 0.355-m Newtonian reflector)
2017 Mar. 01.14, 12.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 Feb. 27.91, 14.5, 0.7' (S. Szabo, Sopron, 0.6-m Newtonian reflector)
2017 Feb. 26.83, 14.3, 0.9' (J. Cerny, 0.355-m Newtonian reflector)
2017 Feb. 24.96, 14.3, 0.4' (T. Karhula, Lysvik, Sweden, 0.305-m Newtonian reflector)

330P/Catalina
Total-magnitude and coma-diameter estimates:
2017 Mar. 04.02, 15.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2017 Mar. 02.02, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2013 V4 (Catalina)
Total-magnitude and coma-diameter estimates:
2017 Mar. 03.21, 14.8, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 Feb. 24.20, 15.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2013 X1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Feb. 28.79, 16.4, 0.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)

C/2014 W2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 08.76, 16.6, 0.5' (R. Ramlow, 0.7-m Newtonian reflector)
2017 Feb. 26.27, 14.8, 0.6' (K. Hills, 0.5-m Newtonian reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 25.78, 8.6, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x40 binoculars)
2017 Mar. 24.84, 9.0, 5' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Mar. 24.84, 8.9, 5.5' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Mar. 24.78, 9.4, 4.4' (R. Ramlow, 0.406-m Newtonian reflector; 15.2' tail in p.a. 260)
2017 Mar. 15.50, 9.2, 11' (T. Lehmann, 0.106-m refractor; 0.25-deg tail in p.a. 261)
2017 Mar. 09.23, 9.1, 5' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Mar. 09.22, 9.3, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 08.68, 10.4, 2.3' (C. Wyatt, 0.25-m Newtonian reflector; 5.0' tail in p.a. 272)
2017 Mar. 07.47, 9.5, 3' (C. Hergenrother, 30x125 binoculars)
2017 Mar. 07.27, 10.1, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 06.69, 10.0, 2.8' (C. Wyatt, 0.25-m Newtonian reflector; 5.4' tail in p.a. 235)
2017 Mar. 03.80, 10.7, 1.1' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 03.15, 9.7, 2.3' (J. Cerny, 0.355-m Newtonian reflector)
2017 Mar. 02.70, 9.6, 3.3' (C. Hergenrother, 0.51-m Ritchey-Chretien)
2017 Mar. 02.50, 9.7, 10' (T. Lehmann, 0.106-m refractor; 0.08-deg tail in p.a. 270)
2017 Feb. 28.31, 11.3, 1' (M. Goiato, 0.22-m Newtonian reflector)
2017 Feb. 24.71, 10.3, 6' (T. Lehmann, 0.4-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 Mar. 25.95, 10.6, 3.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 25.92, 9.6, 5' (M. Meyer, 0.152-m refractor)
2017 Mar. 25.06, 9.2, 3.4' (W. Kutschera, 0.25-m Newtonian reflector; 0.11-deg tail)
2017 Mar. 24.90, 10.1, 3.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 24.84, 10.1, 1' (U. Pilz, 0.32-m Newtonian reflector; 0.08-deg tail in p.a. 260)
2017 Mar. 23.39, 9.5, 6.7' (R. Ramlow, 0.15-m Newtonian reflector; 12.8' tail in p.a. 315)
2017 Mar. 22.91, 10.6, 1.7' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 5.0' tail in p.a. 305)
2017 Mar. 22.57, 9.5, 5.5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 Mar. 21.99, 10.0, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 21.93, 10.4, 2' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 5.5' tail in p.a. 305)
2017 Mar. 21.92, 9.4, 5' (T. Karhula, Virsbo, Sweden, 10x50 binoculars)
2017 Mar. 20.86, 10.9, 1.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 20.46, 9.7, 3.4' (S. Aguirre, Hillo, Mex., 0.15-m Schmidt-Cassegrain)
2017 Mar. 20.04, 9.7, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 320)
2017 Mar. 20.03, 10.1, 3' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2017 Mar. 19.28, 9.7, 4' (C. Hergenrother, 30x125 binoculars)
2017 Mar. 18.94, 9.8, 3.5' (T. Karhula, Virsbo, Sweden, 18x50 binoculars)
2017 Mar. 18.85, 9.8, 1.1' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 17.83, 9.7, 2.5' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2017 Mar. 17.42, 9.2, 20' (T. Lehmann, 0.106-m refractor; 0.27-deg tail in p.a. 320)
2017 Mar. 17.04, 10.8, 2.63' (D. Buczynski, Tarbatness Observatory MPC Code I81, 0.35-m Schmidt-Cassegrain)
2017 Mar. 16.84, 9.8, 2' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector)
2017 Mar. 15.88, 10.5, 2.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 15.00, 11.4, 1.88' (D. Buczynski, Tarbatness MPC Code I81, 0.35-m Schmidt-Cassegrain)
2017 Mar. 11.19, 10.7, 1.2' (G. van Buitenen, Dordrecht, NL, 0.305-m Newtonian reflector)
2017 Mar. 08.47, 9.5, 19' (T. Lehmann, 0.106-m refractor; 0.26-deg tail in p.a. 320)
2017 Mar. 07.46, 9.7, 4' (C. Hergenrother, 30x125 binoculars)
2017 Mar. 07.03, 9.8, 2.6' (K. Hills, 0.5-m Newtonian reflector; 4.5' tail in p.a. 320)
2017 Mar. 06.88, 11.2, 2.25' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector; 6.8' tail in p.a. 319)
2017 Mar. 06.74, 10.3, 2.6' (C. Wyatt, 0.25-m Newtonian reflector)
2017 Mar. 05.17, 9.6, 2.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Mar. 03.04, 10.5, 2.2' (J. Cerny, 0.355-m Newtonian reflector; 0.15-deg tail in p.a. 310)
2017 Mar. 02.97, 10.2, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Mar. 02.94, 9.6, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 2.4' tail in p.a. 293)
2017 Mar. 02.93, 11.6, 1.1' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 5.5' tail in p.a. 315)
2017 Mar. 02.83, 10.9, 1.5' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector; 6.7' tail in p.a. 324)
2017 Mar. 02.49, 9.5, 16' (T. Lehmann, 0.106-m refractor; 0.24-deg tail in p.a. 321)
2017 Mar. 02.43, 10.2, 3.56' (N. Paul, Mayhill, New Mexico (MPC Code - H06), 0.431-m Cassegrain reflector; 9.8-deg tail in p.a. 322)
2017 Mar. 02.32, 10.0, 4.5' (R. Ramlow, 0.106-m refractor; 12.4' tail in p.a. 318)
2017 Mar. 02.00, 9.9, 4' (P. Guzik, 10x50 binoculars)
2017 Feb. 28.16, 9.7, 3.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Feb. 28.05, 9.7, 4' (P. Guzik, 10x50 binoculars)
2017 Feb. 27.05, 10.2, 2.5' (P. Guzik, 0.08-m refractor)
2017 Feb. 27.05, 10.2, 3.2' (G. Scheerle, 0.235-m Schmidt-Cassegrain; 0.12-deg tail in p.a. 320)
2017 Feb. 26.92, 11.0, 1' (W. Hasubick, 0.44-m Newtonian reflector; 0.07-deg tail in p.a. 305)
2017 Feb. 26.10, 10.5, 2' (C. Labordena, Castellfort, 0.2-m Schmidt-Cassegrain)
2017 Feb. 25.16, 10.9, 3' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 Feb. 25.00, 9.7, 4' (P. Guzik, 10x50 binoculars)
2017 Feb. 24.99, 10.3, 2' (P. Guzik, 0.27-m Newtonian reflector; 0.15-deg tail in p.a. 300)
2017 Feb. 24.99, 9.9, 4' (J. Gonzalez Suarez, 25x100 binoculars)
2017 Feb. 24.95, 11.5, 1' (A. Scholten, Bussloo, 0.356-m Schmidt-Cassegrain)
2017 Feb. 24.94, [10.3, 2' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 Feb. 24.90, 10.8, 0.9' (C. Harder, Jeersdorf, Germany , 0.406-m Newtonian reflector; 3.0' tail in p.a. 335)
2017 Feb. 24.88, 10.3, 1.5' (T. Karhula, Lysvik, Sweden, 0.305-m Newtonian reflector; 3.0' tail in p.a. 305)
2017 Feb. 24.01, 10.2, 2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 3.5' tail in p.a. 289)

C/2015 X7 (ATLAS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 01.13, 17.6, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 04.00, 15.6, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2016 A3 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 01.09, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 17.49, 16.8, 0.5' (T. Lehmann, 0.51-m Newtonian reflector)
2017 Mar. 02.51, 17.0, 1' (T. Lehmann, 0.106-m refractor)

C/2016 VZ18 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 19.81, 11.8, 2' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2017 Mar. 16.12, 13.4, 1.7' (R. Ramlow, 0.106-m refractor)
2017 Mar. 15.87, 10.8, 3.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 15.79, 13.2, 1.2' (P. Guzik, 0.326-m Newtonian reflector)
2017 Mar. 03.11, 13.8, 1.3' (R. Ramlow, 0.25-m Newtonian reflector)
2017 Feb. 27.77, 13.4, 3.3' (T. Lehmann, 0.075-m reflector)
2017 Feb. 25.86, 11.3, 1' (C. Labordena, Castellfort, 0.2-m Schmidt-Cassegrain)
2017 Feb. 25.15, 14.3, 1.2' (R. Ramlow, 0.106-m refractor)
2017 Feb. 24.87, 10.7, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

C/2017 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Mar. 02.00, 17.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2017 Mar. 03.19, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 D2 (Barros)
Total-magnitude and coma-diameter estimates:
2017 Mar. 16.78, 16.9, 0.23' (R. Ramlow, 0.7-m Newtonian reflector)

C/2017 E1 (Borisov)
Total-magnitude and coma-diameter estimates:
2017 Mar. 20.20, 9.7, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 09.23, 12.4, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 Mar. 09.20, 11.2, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 06.77, 12.8, 2.1' (R. Ramlow, 0.406-m Newtonian reflector)
2017 Mar. 03.81, 12.2, 1.4' (S. Yoshida, 0.4-m Newtonian reflector)

C/2017 E4 (Lovejoy)
Total-magnitude and coma-diameter estimates:
2017 Mar. 25.77, 9.0, 3.5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x40 binoculars)
2017 Mar. 25.48, 9.4, 6.5' (R. Ramlow, 0.106-m refractor)
2017 Mar. 24.85, 9.3, 4' (A. Pearce, Nedlands, 0.2-m Newtonian reflector)
2017 Mar. 24.85, 9.2, 5.5' (A. Pearce, Nedlands, 0.1-m Newtonian reflector)
2017 Mar. 24.78, 9.6, 5.3' (R. Ramlow, 0.406-m Newtonian reflector)
2017 Mar. 20.21, 8.6, 4.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 Mar. 16.75, 12.4, 1.8' (R. Ramlow, 0.7-m Newtonian reflector)